Add all key:value required by schema to imported threat models

[jgadsden]

Describe what problem your feature request solves: Threats have ID numbers when created in version 2.x threat models these ID numbers are not present in all version 1.x models This leads to JSON schema warnings that can be avoided if the version 1.x import to version 2.x adds all key:value required by schema to these imported threat models

Describe the solution you'd like: Ensure that all imported threat models have ID numbers when importing version 1.x threats ensure that all key:value pairs requireds by the Version 2.x schema are present and added if missing

Additional context:

[avinxshKD]

@jgadsden Im intrested to work on this, please assign it to me.